Particulate Organic Matter and Water‐Stable Aggregation of Soil under Contrasting Management

摘要: Soil organic matter (SOM) is important to soil function. The objectives of this work were determine the effect cropping rotation and management on SOM, components water-stable aggregation (WSA) near surface. Measurements made collected from top 50 mm seven sites representing contrasts between alternative conventional management. Management included tillage, crop rotation, native grass pasture, corn (Zea mays L.) stover removal as silage. At each site, approximately 10 kg was replication. separated into six aggregate groups using a rotary sieve. Aggregate size ranges for Groups 1 6 were: 19 mm. Mean weight diameter calculated dry distribution. Dry stability, WSA, carbon (SC), fine particulate (fPOM), coarse POM measured aggregates group. Components SOM not uniformly distributed among groups. Average SC (seven sites) significantly greater under (31.0 g -1 ) than (22.3 No tillage (NT) increased fPOM/SOM by 37% compared with following 4 yr NT, respectively. A 5-yr diverse 36% monoculture. There significant, positive relationship (r 2 = 0.79) WSA fPOM/SOM. Diversity or reduction fPOM may help curb loss maintaining surface conditions resistant erosion.